Grammar in ‘agrammatical’ aphasia: what’s intact?

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• dc.contributor.author Zhang, Han
• dc.contributor.author Hinzen, Wolfram
• dc.date.accessioned 2023-03-13T07:17:18Z
• dc.date.available 2023-03-13T07:17:18Z
• dc.date.issued 2022
• dc.description.abstract Background: Aphasia following cerebro-vascular accidents has been a primary source of insight for models of language in the brain. However, deviant language patterns in aphasia may reflect processing limitations and cognitive impairment more than language impairment per se. Aims: We sought to obtain new evidence from spontaneous speech in Broca’s aphasia (BA) for the intactness of grammatical knowledge, operationalized as the preservation of the basic hierarchical structure of syntactic projections. Methods & procedures: Speech obtained with the AphasiaBank protocol from 20 people with BA, which were independently rated as also being agrammatic, was analyzed and compared to 20 matched non-brain-damaged controls. We quantified (i) marking of Aspect, Tense, and Modality (A-T-M), which are located at specific (high) layers of the syntactic hierarchy and ordered in relation to one another ([M…[T…[A…]]]); (ii) hierarchies of clausal units ([C…[C]]); (iii) discourse markers embedding clauses, located at the highest layer of the hierarchy; and (iv) attachment of adjuncts at different heights of a given hierarchical syntactic structure. Supplementary evidence was obtained from a typology of errors and from pauses subcategorized according to their hierarchical syntactic position. Outcomes & results: Groups did not quantitatively differ on rates of either Aspect or Modality but underproduced T and embedded clauses. Evidence for compensatory effects was seen in both of the latter two cases. While all adjunct types were underproduced in BA, and pauses overproduced, both showed the same relative proportions within both groups. Errors were largely restricted to omissions, of a kind that would also be expected in condensed neurotypical speech. Conclusions: Overall, these patterns support the hypothesis of intactness of grammatical knowledge in BA clinically rated as agrammatic, questioning it as a disease model of language impairment.
• dc.description.sponsorship This work was supported by the Ministerio de Ciencia, Innovación y Universidades (MCIU) and the Agencia Estatal de Investigación (AEI) (https://www.aei.gob.es/) under Grant PID2019-105241GB-I00/AEI/10.13039/501100011033 to WH, and the Generalitat de Catalunya (Agència de Gestió d’Ajuts Universitaris i de Recerca) & European Social Found (https://agaur.gencat.cat/en/inici/) under Grant 2021 FI_B 00166 to HZ.
• dc.format.mimetype application/pdf
• dc.identifier.citation Zhang H, Hinzen W. Grammar in ‘agrammatical’ aphasia: what’s intact? PLoS One. 2022;17(12): e0278676. DOI: 10.1371/journal.pone.0278676
• dc.identifier.doi http://dx.doi.org/10.1371/journal.pone.0278676
• dc.identifier.issn 1932-6203
• dc.identifier.uri http://hdl.handle.net/10230/56168
• dc.language.iso eng
• dc.publisher Public Library of Science (PLoS)
• dc.relation.ispartof PLoS One. 2022;17(12): e0278676.
• dc.relation.isreferencedby http://doi.org/10.1371/journal.pone.0278676.t001
• dc.relation.isreferencedby https://doi.org/10.1371/journal.pone.0278676.t002
• dc.relation.isreferencedby https://doi.org/10.1371/journal.pone.0278676.s001
• dc.relation.isreferencedby https://doi.org/10.1371/journal.pone.0278676.s002
• dc.relation.projectID info:eu-repo/grantAgreement/ES/2PE/PID2019-105241GB-I00
• dc.rights © 2022 Zhang, Hinzen. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
• dc.rights.accessRights info:eu-repo/semantics/openAccess
• dc.rights.uri http://creativecommons.org/licenses/by/4.0/
• dc.subject.other Afàsia
• dc.subject.other Trastorns del llenguatge
• dc.title Grammar in ‘agrammatical’ aphasia: what’s intact?
• dc.type info:eu-repo/semantics/article
• dc.type.version info:eu-repo/semantics/publishedVersion